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This study focused on solar water heaters, crucial for cold climates, aiming to design and develop two heat pipe and U-pipe-based evacuated tube collectors (ETCs). The study evaluated the thermal output of these collectors under similar environmental conditions at various mass flow rates. Results indicate that the U-pipe-based ETC achieved a daily thermal performance of 62.83 at 8 LPH and 71.47% at 16 LPH. Meanwhile, the heat pipe-based ETC obtained daily thermal performance of 59.14% at 8 LPH and 68.54% at 16 LPH. So, it was revealed that the maximum thermal output was achieved by U-pipe-based ETC rather than heat pipe-based ETC at both flow rates. Also, it indicated that U-pipe-based ETC obtained an increase in energy enhancement ratio in the range of 4.74–9.73% compared to heat pipe-based ETC. Furthermore, it concluded that both heat exchanger-based collectors have advantages and disadvantages, and their thermal performance depends on various factors, i.e., specific design, operating conditions, and the intended application.

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Experimental Investigation of Heat Pipe Versus U-Pipe Evacuated Tube Collectors: Analyzing Thermal Performance

  • 会议论文

  • 发表日期：

    2025年

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  • Sudhir Kumar Pathak,
  • V. V. Tyagi

摘要

This study focused on solar water heaters, crucial for cold climates, aiming to design and develop two heat pipe and U-pipe-based evacuated tube collectors (ETCs). The study evaluated the thermal output of these collectors under similar environmental conditions at various mass flow rates. Results indicate that the U-pipe-based ETC achieved a daily thermal performance of 62.83 at 8 LPH and 71.47% at 16 LPH. Meanwhile, the heat pipe-based ETC obtained daily thermal performance of 59.14% at 8 LPH and 68.54% at 16 LPH. So, it was revealed that the maximum thermal output was achieved by U-pipe-based ETC rather than heat pipe-based ETC at both flow rates. Also, it indicated that U-pipe-based ETC obtained an increase in energy enhancement ratio in the range of 4.74–9.73% compared to heat pipe-based ETC. Furthermore, it concluded that both heat exchanger-based collectors have advantages and disadvantages, and their thermal performance depends on various factors, i.e., specific design, operating conditions, and the intended application.